What mass of glucose ( C ₆ H ₁₂ O ₆ ) must be dissolved in 500 g of water to prepare a 0.2 m aqueous solution? (Molar mass of glucose = 180 g mol ⁻¹ )

Step-by-step solution

Molality is defined as the number of moles of solute per kilogram of solvent. m = w 1000 M W Where w is the mass of solute, M is the molar mass of solute, and W is the mass of solvent in grams. Substituting the given values: 0.2 = w 1000 180 500 0.2 = w 2 180 0.2 = w 90 w = 18 g Answer: 18 g